Remove block from estimate request; Improve error messages

[rmeissner]

Changes proposed in this pull request:

• Fix bug that estimate was not working because too many params were supplied
• Improved error messages for better debugging
• Add sourcesJar task for jitpack

@gnosis/mobile-devs

[codecov-io]

Codecov Report

Merging #10 into master will increase coverage by 0.13%. The diff coverage is 81.25%.

@@             Coverage Diff              @@
##             master      #10      +/-   ##
============================================
+ Coverage     65.85%   65.99%   +0.13%     
  Complexity      142      142              
============================================
  Files            48       48              
  Lines          1031     1035       +4     
  Branches        183      181       -2     
============================================
+ Hits            679      683       +4     
+ Misses          266      265       -1     
- Partials         86       87       +1

Impacted Files	Coverage Δ	Complexity Δ
.../java/pm/gnosis/ethereum/rpc/models/RpcRequests.kt	88.4% <0%> (-0.17%)	0 <0> (ø)
...va/pm/gnosis/ethereum/rpc/RpcEthereumRepository.kt	93.87% <100%> (+3.13%)	7 <0> (ø)	:arrow_down:
...main/java/pm/gnosis/ethereum/EthereumRepository.kt	65.78% <80%> (+5.07%)	0 <0> (ø)	:arrow_down:

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